/Engine/Source/Runtime/SlateCore/Public/Widgets/SWidget.h
This event is primarily to allow parent widgets to consume an event before a child widget processes it and it should be used only when there is no better design alternative.
Returns whether the event was handled, along with other possible actions
virtual [FReply](API\Runtime\SlateCore\Input\FReply) OnPreviewKeyDown ( const [FGeometry](API\Runtime\SlateCore\Layout\FGeometry) & MyGeometry, const [FKeyEvent](API\Runtime\SlateCore\Input\FKeyEvent) & InKeyEvent )